Finally, some threads are able to perform some special cleanup processing as part of being terminated (either through cancellation or through a pthread_exit call). The degree to which a thread persists after it has been asked to go away is known as its cancelability type. Now you must consider when it might go away≈maybe immediately, maybe a bit later. Let's assume that you can indeed cancel this thread. The ability of a thread to go away or not go away when asked by another thread is known as its cancelability state.
Now you must reckon whether the thread you've targeted can be canceled at all. Okay, so you've decided that you'd like to cancel a thread. If one thread returns the results you are looking for, all other threads running the same routine could be canceled. In an odd sense, you can consider cancellation to be a very rough synchronization mechanism: after you've canceled a thread, you know exactly where it is in its execution! A simple example of a thread you might want to cancel would be a thread performing a read-only data search. One reason you may want to cancel a thread is to save system resources (such as CPU time) when your program determines that the thread's activity is no longer necessary. Pthreads ProgrammingChapter 4 - Managing Pthreadsīradford Nichols, Dick Buttlar and Jacqueline Proulx FarrellĬopyright ╘ 1996 O'Reilly & Associates, Inc.Ĭancellation allows one thread to terminate another.
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